---
title: tool_manager
sidebarTitle: tool_manager
---

# `fastmcp.tools.tool_manager`

## Classes

### `ToolManager` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L23" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Manages FastMCP tools.


**Methods:**

#### `has_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L60" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
has_tool(self, key: str) -> bool
```

Check if a tool exists.


#### `get_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L65" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
get_tool(self, key: str) -> Tool
```

Get tool by key.


#### `get_tools` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L72" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
get_tools(self) -> dict[str, Tool]
```

Gets the complete, unfiltered inventory of local tools.


#### `add_tool_from_fn` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L78" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
add_tool_from_fn(self, fn: Callable[..., Any], name: str | None = None, description: str | None = None, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, serializer: Callable[[Any], str] | None = None, exclude_args: list[str] | None = None) -> Tool
```

Add a tool to the server.


#### `add_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L107" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
add_tool(self, tool: Tool) -> Tool
```

Register a tool with the server.


#### `add_tool_transformation` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L124" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
add_tool_transformation(self, tool_name: str, transformation: ToolTransformConfig) -> None
```

Add a tool transformation.


#### `get_tool_transformation` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L130" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
get_tool_transformation(self, tool_name: str) -> ToolTransformConfig | None
```

Get a tool transformation.


#### `remove_tool_transformation` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L134" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
remove_tool_transformation(self, tool_name: str) -> None
```

Remove a tool transformation.


#### `remove_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L139" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
remove_tool(self, key: str) -> None
```

Remove a tool from the server.

**Args:**
- `key`: The key of the tool to remove

**Raises:**
- `NotFoundError`: If the tool is not found


#### `call_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L153" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
call_tool(self, key: str, arguments: dict[str, Any]) -> ToolResult
```

Internal API for servers: Finds and calls a tool, respecting the
filtered protocol path.

